Question

Keeping the p.d constant the resistance of a circuit is halved. The current will become

Answer 1

1. I= V/R      

WHEN THE RESISTANCE IS HALVED

THEREFORE  

                     R'= R/2

New   I = V/R'

            = V/R/2

             = V× 2/R

            =  2V/R .  ( FROM 1)

            = 2I

NEW CURRENT WILL BE TWO TIMES THE OLD CURRENT